Basic routines for decimal arithmetic in Julia. Supports addition, subtraction, negation, multiplication, division, and equality operations; exponentiation coming as soon as I find the time to write it. This is a pure Julia implementation, so if you are concerned about pure speed, calling libmpdec functions directly is likely to be faster. Tested in Julia 0.6. Clearly, this is not okay for fields like finance, where it's important to be able to trust that $0.30 is actually 30 cents, rather than 30.000000000000004 cents.